Single and low-lying states dominance in two-neutrino double-beta decay

Abstract

A theoretical analysis of the single-state dominance hypothesis for the two-neutrino double-beta decay rates is performed on the examples of the double-beta decays of 100Mo, 116Cd, and 128Te. We also test the validity of an extended low-lying-state dominance that takes into account the contributions of the low-lying excited states in the intermediate nucleus to the double-beta decay rates. This study has been accomplished for all the double-beta emitters for which we have experimental information on their half-lives. The theoretical framework is a proton-neutron quasiparticle random-phase approximation based on a deformed Skyrme Hartree-Fock mean field with pairing correlations. Our calculations indicate that there are not clear evidences for single- or low-lying-state dominance in the two-neutrino double-beta decay. Finally, we investigate the single electron energy distributions of the outgoing electrons in the double-beta decay processes with an exact treatment of the energy denominators, which could help to a more comprehensive analysis of NEMO-3 data.

arXiv comment19 pages, 6 figures

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Cited by in corpus (17)

• Large-Scale Calculations of the Double-Beta Decay of 76Ge, 130Te, 136Xe, and 150Nd in the Deformed Self-Consistent Skyrme Quasiparticle Random-Phase Approximation
• The $0\nu \beta \beta$-decay nuclear matrix element for light and heavy neutrino mass mechanisms from deformed QRPA cacluations for ${}^{76}$Ge, ${}^{82}$Se, ${}^{130}$Te, ${}^{136}$Xe and ${}^{150}$Nd with isospin restoration
• Evidence of Single State Dominance in the Two-Neutrino Double-$\beta$ Decay of Se-82 with CUPID-0
• Measurement of the 2$\nu \beta \beta$ Decay Half-life of ${}^{130}$Te with CUORE
• Q-Value and Half-Lives for the Double-Beta-Decay Nuclide 110Pd
• Two-neutrino double-beta decay in pionless effective field theory from a Euclidean finite-volume correlation function
• Running sums for $2\nu \beta \beta$-decay matrix elements within the QRPA with account for deformation
• Deformation effects on the Gamow-Teller strength distributions in the double-beta decay partners 76Ge and 76Se
• Isoscalar pairing interaction for the quasiparticle random-phase approximation approach to double-$\beta$ and $\beta$ decays
• Theoretical mean field and experimental occupation probabilities in the double beta decay system 76Ge to 76Se
• Overlap of QRPA states based on ground states of different nuclei --mathematical properties and test calculations--
• Low-energy structure and $\beta$ decay properties of neutron-rich nuclei in the region of a shape phase transition
• Gamow-Teller properties of the double beta-decay partners 116Cd(Sn) and 150Nd(Sm)
• Effects of pairing strength on the nuclear structure and double-$\beta$ decay predictions within the mapped interacting boson model
• Nuclear structure calculations for two-neutrino double-beta decay
• Results on ${}^{82}$Se $2\nu \beta \beta$ with CUPID-0 Phase I
• What can we learn from recent $2\nu \beta \beta$ experiments?